Journal
JOURNAL OF MOTOR BEHAVIOR
Volume 33, Issue 1, Pages 3-8Publisher
ROUTLEDGE JOURNALS, TAYLOR & FRANCIS LTD
DOI: 10.1080/00222890109601897
Keywords
finger movement; human timing; long memory process; motor coordination; multiple time scales; 1/f noise; synchronization; syncopation
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The authors analyzed fluctuations in timing errors when 8 human participants attempted to coordinate movement with external rhythmic signals. The temporal dynamics of the errors is usually described in terms of simple, self-correcting models. Here the authors demonstrate that timing errors are characterized by a 1/f(alpha): type of long memory process. The value of the exponent a differentiates different types of coordination states: synchronization and syncopation. More interesting, evidence was found that a can be changed when participants use different coordination strategies. Together with the authors' understanding of the generation mechanism for long memory processes, these results suggest that 1/f(alpha) type of long-range correlated timing errors are of higher cortical origin and are likely the outcome of distributed neural processes acting on multiple time scales.
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